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Finding the Fourth Proportional to 785.65, 1,179.61 and 438.92

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Solution

The fourth proportional to 785.65, 1,179.61 and 438.92 is: 659.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.65 : 1,179.61 = 438.92 : x
  2. Step 2: Convert to fraction form
    785.65/1,179.61 = 438.92/x
  3. Step 3: Cross multiply
    785.65x = 1,179.61 × 438.92
  4. Step 4: Simplify right side
    785.65x = 517,754.32
  5. Step 5: Solve for x
    x = 517,754.32/785.65
  6. Step 6: Final answer
    x = 659.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.